Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95e4d06a12d5d48…

MALICIOUS

PDF

105.3 KB Created: 2021-04-16 02:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 02dd5ffaf1dfde0b8e4c7c2ec734aec6 SHA-1: e8f6239118f1c6f49c81a8f5809afdedc4e794c6 SHA-256: c95e4d06a12d5d4871cc05840542c4ea95f68ff890d6f2447dc6425db4cbc1c3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/strik?utm_term=psychological+assessment+resources+mmse PDF link annotation
    • https://cdn.sqhk.co/rutunidosaw/lNijbii/larry_h_miller_megaplex_centerville_showtimes.pdfIn PDF document text
    • https://cdn.sqhk.co/wenisuvuroju/hfjfKhg/60171916070.pdfIn PDF document text
    • http://emmetrix.net/que_es_un_autorretenedor_en_colombiap46vi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424632/normal_606c5b7a34984.pdfIn PDF document text
    • http://jovopomutulilo.medianewsonline.com/tiwapowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_601ceafa851dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493579/normal_60074c41e741c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388627/normal_6041ee79420c1.pdfIn PDF document text
    • http://habirovradik.ru/les_mis_musical_summaryzl4p2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468534/normal_5fd28c6a08b7a.pdfIn PDF document text
    • http://osummer.space/plank_exercise_guider454i.pdfIn PDF document text
    • http://stavki.link/beethoven_sheet_musiciq144.pdfIn PDF document text
    • http://gokojun.scienceontheweb.net/86521896316.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_57a659ce032d45059a754b2777e1a6bf.pdf?index=trueIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_82e426fe01fa4a22afa0d949cf3dd65b.pdf?index=trueIn PDF document text
    • https://0d801636-e20c-47cf-9654-f2c4f0d28fb9.filesusr.com/ugd/2e7c9c_d8eac39f416d4dd78d149bede9214799.pdf?index=trueIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_2a35d26ef35641ba91c89ee763a4e901.pdf?index=trueIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_105374f256a44cf4b93553b9961e4550.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_c6bc891df8f1496b9006ac3f38f3b469.pdf?index=trueIn PDF document text
    • https://fac7854b-22c3-40b9-bef9-ee94a55a010d.filesusr.com/ugd/fba82c_efef181ffe504bf081038e1624192d3a.pdf?index=trueIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_ebeaa5d64ddf4a2c8d4fb60844a32edd.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_457179d360c14cbf9b67c6d7f3047a58.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000159a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A3 5316 bytes
SHA-256: 129fee0f455a7c58db205c44c12c8a2f7d88a6fe2c16489c917f00d4fff2ffac
font_01_sfnt_off00016b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B95 13024 bytes
SHA-256: a2e04fcd599f74dd6d6fed8dbe56ce0731f0c0209e1ea2e463b359e8f37be6a2